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-rw-r--r--gnu/build/linux-modules.scm52
1 files changed, 51 insertions, 1 deletions
diff --git a/gnu/build/linux-modules.scm b/gnu/build/linux-modules.scm
index 9b9fc0d9d8..a73ccaf511 100644
--- a/gnu/build/linux-modules.scm
+++ b/gnu/build/linux-modules.scm
@@ -51,7 +51,8 @@
matching-modules
missing-modules
- write-module-alias-database))
+ write-module-alias-database
+ write-module-device-database))
;;; Commentary:
;;;
@@ -507,4 +508,53 @@ are required to access DEVICE."
aliases)))
aliases))))
+(define (aliases->device-tuple aliases)
+ "Traverse ALIASES, a list of module aliases, and search for
+\"char-major-M-N\", \"block-major-M-N\", or \"devname:\" aliases. When they
+are found, return a tuple (DEVNAME TYPE MAJOR MINOR), otherwise return #f."
+ (define (char/block-major? alias)
+ (or (string-prefix? "char-major-" alias)
+ (string-prefix? "block-major-" alias)))
+
+ (define (char/block-major->tuple alias)
+ (match (string-tokenize alias %not-dash)
+ ((type "major" (= string->number major) (= string->number minor))
+ (list (match type
+ ("char" "c")
+ ("block" "b"))
+ major minor))))
+
+ (let* ((devname (any (lambda (alias)
+ (and (string-prefix? "devname:" alias)
+ (string-drop alias 8)))
+ aliases))
+ (major/minor (match (find char/block-major? aliases)
+ (#f #f)
+ (str (char/block-major->tuple str)))))
+ (and devname major/minor
+ (cons devname major/minor))))
+
+(define %not-dash
+ (char-set-complement (char-set #\-)))
+
+(define (write-module-device-database directory)
+ "Traverse the '.ko' files in DIRECTORY and create the corresponding
+'modules.devname' file. This file contains information about modules that can
+be loaded on-demand, such as file system modules."
+ (define aliases
+ (filter-map (lambda (file)
+ (match (aliases->device-tuple (module-aliases file))
+ (#f #f)
+ (tuple (cons (file-name->module-name file) tuple))))
+ (find-files directory "\\.ko$")))
+
+ (call-with-output-file (string-append directory "/modules.devname")
+ (lambda (port)
+ (display "# Device nodes to trigger on-demand module loading.\n" port)
+ (for-each (match-lambda
+ ((module devname type major minor)
+ (format port "~a ~a ~a~a:~a~%"
+ module devname type major minor)))
+ aliases))))
+
;;; linux-modules.scm ends here